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Thread: short stroking AR

  1. #1
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    Question short stroking AR

    Hey guys,

    My first AR related post here goes...

    So I took my new LRB lower / Del-Ton upper AR out to the range today. She was short stroking every three or four rounds. The ammo and mags are not suspect as they function in my colt carbine with no issues.

    No fte's only ftf's. I believe this to be a short stroking issue as she wouldn't lock open when one round was chambered and fired.

    The rings look good, the gaps were staggered.

    Someone suggested I was not running wet enough or that I needed to take fine steel wool to the bcg as it is brand new... any thoughts?

    20" rifle length upper 1/9 twist, LRB lower (that I assembled), A2 Stock (cause I live in NY), using 55grn Remington UMC Ammo

    Thanks!

  2. #2
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    Quote Originally Posted by truckie453 View Post
    Hey guys,

    My first AR related post here goes...

    So I took my new LRB lower / Del-Ton upper AR out to the range today. She was short stroking every three or four rounds. The ammo and mags are not suspect as they function in my colt carbine with no issues.

    No fte's only ftf's. I believe this to be a short stroking issue as she wouldn't lock open when one round was chambered and fired.

    The rings look good, the gaps were staggered.

    Someone suggested I was not running wet enough or that I needed to take fine steel wool to the bcg as it is brand new... any thoughts?

    20" rifle length upper 1/9 twist, LRB lower (that I assembled), A2 Stock (cause I live in NY), using 55grn Remington UMC Ammo


    Thanks!
    I would try some different ammo Remington umc is very weak ammo.
    I had some remington UMC last spring that gave me a couple of short strokes.
    Last edited by Thomas M-4; 03-02-10 at 00:57.

  3. #3
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    Like Thomas said, UMC is weak. But I still think it should cycle it. You might just need your gas ports opened up a little to do so. Or you could try taking weight out of the buffer.

  4. #4
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    Quote Originally Posted by Thomas M-4 View Post
    I would try some different ammo Remington umc is very weak ammo.
    I had some remington UMC last spring that gave me a couple of short strokes.
    Thanks, I will definitely try some different ammo, I had not thought of it as the weak point.
    -Vinny

    The things that may or may not be true are the things a man needs to believe in the most. People are good; honor, courage, virtue mean everything; power and money mean nothing; good always triumphs over evil; true love never dies. A man should believe in those things, because worth they believing in.

  5. #5
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    Quote Originally Posted by JonnyVain View Post
    Like Thomas said, UMC is weak. But I still think it should cycle it. You might just need your gas ports opened up a little to do so. Or you could try taking weight out of the buffer.
    Is there a specific weight that the buffer should be? Is this something I can do myself (this is my second AR and and my first "built by me" AR)
    -Vinny

    The things that may or may not be true are the things a man needs to believe in the most. People are good; honor, courage, virtue mean everything; power and money mean nothing; good always triumphs over evil; true love never dies. A man should believe in those things, because worth they believing in.

  6. #6
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    Leave the buffer for now, try different ammo, then decide if you need to mess with the buffer. Also, check your gas key to make sure it isn't loose. I'm betting it is loose, my cousin's Del Ton BCG was neither staked, nor tightened to spec. He shot it loose in a jiffy. I was not impressed.

  7. #7
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    Make sure that you are in fact using a rifle buffer. Perform the gas ring test (gas rings don't need to be staggered, BTW) and check that the carrier key screws are tight and staked.

  8. #8
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    I'd check ammo, gas rings, gas key, gas port size in this order
    *** Damn Proud to Be an American Ally ! ***

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  9. #9
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    Quote Originally Posted by The_Katar View Post
    Make sure that you are in fact using a rifle buffer. Perform the gas ring test (gas rings don't need to be staggered, BTW) and check that the carrier key screws are tight and staked.
    This.
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  10. #10
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    Quote Originally Posted by The_Katar View Post
    Make sure that you are in fact using a rifle buffer. Perform the gas ring test (gas rings don't need to be staggered, BTW) and check that the carrier key screws are tight and staked.
    the buffer is longer than my carbine buffer the spring is longer too. Is there a specific weight or length I should be looking for?
    -Vinny

    The things that may or may not be true are the things a man needs to believe in the most. People are good; honor, courage, virtue mean everything; power and money mean nothing; good always triumphs over evil; true love never dies. A man should believe in those things, because worth they believing in.

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